Methods and apparatus for applying internal features or complex mechanical structures to a surface of a metal part are disclosed. The controller includes a one-touch activation control. The axial cam follower displacement is transformed into a rotational torque on the work load support about the pivot joint, which results in rotation of the work load support about the rotational axis of the pivot joint. The control box accommodates therein the high-voltage distribution part and the low-voltage control board. The position determination system uses the GPS signals received at the GPS antenna that is nearest the vehicle to generate a global position fix that approximates a GPS position of the vehicle. An average refractive index of the convex portion is smaller than an average refractive index of the concave portion.